class Parent1:
    variables = Dict(parent_var=1)

class Parent2:
    variables = Dict(parent_var=2)

class Middle1(Parent1):
    variables = Parent1.variables + Dict(middle_var=3)

class Middle2(Parent2):
    variables = Parent2.variables + Dict(middle_var=3)

class Child1(Middle1):
    # I want variables to be
    # {parent_var=1, middle_var=3}

class Child2(Middle2):
    # I want variables to be
    # {parent_var=2, middle_var=3}

# Now I want it to be made without 2 duplicate Middle classes, only with one